61881213 has 8 divisors (see below), whose sum is σ = 82584576. Its totient is φ = 41216000.

The previous prime is 61881199. The next prime is 61881217. The reversal of 61881213 is 31218816.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 61881213 - 2⁸ = 61880957 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61881217) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5508 + ... + 12413.

It is an arithmetic number, because the mean of its divisors is an integer number (10323072).

Almost surely, 2^61881213 is an apocalyptic number.

It is an amenable number.

61881213 is a deficient number, since it is larger than the sum of its proper divisors (20703363).

61881213 is a wasteful number, since it uses less digits than its factorization.

61881213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19075.

The product of its digits is 2304, while the sum is 30.

The square root of 61881213 is about 7866.4612755673. The cubic root of 61881213 is about 395.5362326645.

The spelling of 61881213 in words is "sixty-one million, eight hundred eighty-one thousand, two hundred thirteen".