61523131 has 4 divisors (see below), whose sum is σ = 61621264. Its totient is φ = 61425000.

The previous prime is 61523117. The next prime is 61523149. The reversal of 61523131 is 13132516.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 61523131 - 2⁹ = 61522619 is a prime.

It is a super-2 number, since 2×61523131² = 7570191296086322, which contains 22 as substring.

It is a Duffinian number.

It is a zygodrome in base 5.

It is not an unprimeable number, because it can be changed into a prime (61523101) 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, 48120 + ... + 49381.

It is an arithmetic number, because the mean of its divisors is an integer number (15405316).

Almost surely, 2^61523131 is an apocalyptic number.

61523131 is a deficient number, since it is larger than the sum of its proper divisors (98133).

61523131 is an equidigital number, since it uses as much as digits as its factorization.

61523131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98132.

The product of its digits is 540, while the sum is 22.

The square root of 61523131 is about 7843.6682107290. The cubic root of 61523131 is about 394.7718192878.

Adding to 61523131 its reverse (13132516), we get a palindrome (74655647).

The spelling of 61523131 in words is "sixty-one million, five hundred twenty-three thousand, one hundred thirty-one".