61212513 has 4 divisors (see below), whose sum is σ = 81616688. Its totient is φ = 40808340.

The previous prime is 61212511. The next prime is 61212539. The reversal of 61212513 is 31521216.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 61212513 - 2¹ = 61212511 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 61212513.

It is not an unprimeable number, because it can be changed into a prime (61212511) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10202083 + ... + 10202088.

It is an arithmetic number, because the mean of its divisors is an integer number (20404172).

Almost surely, 2^61212513 is an apocalyptic number.

It is an amenable number.

61212513 is a deficient number, since it is larger than the sum of its proper divisors (20404175).

61212513 is a wasteful number, since it uses less digits than its factorization.

61212513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20404174.

The product of its digits is 360, while the sum is 21.

The square root of 61212513 is about 7823.8425981100. The cubic root of 61212513 is about 394.1063233543.

Adding to 61212513 its reverse (31521216), we get a palindrome (92733729).

The spelling of 61212513 in words is "sixty-one million, two hundred twelve thousand, five hundred thirteen".