61523013 has 8 divisors (see below), whose sum is σ = 83154688. Its totient is φ = 40453344.

The previous prime is 61523009. The next prime is 61523023. The reversal of 61523013 is 31032516.

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

It is not a de Polignac number, because 61523013 - 2² = 61523009 is a prime.

It is a super-2 number, since 2×61523013² = 7570162257196338, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61523023) 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, 140245 + ... + 140682.

It is an arithmetic number, because the mean of its divisors is an integer number (10394336).

Almost surely, 2^61523013 is an apocalyptic number.

It is an amenable number.

61523013 is a deficient number, since it is larger than the sum of its proper divisors (21631675).

61523013 is a wasteful number, since it uses less digits than its factorization.

61523013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 281003.

The product of its (nonzero) digits is 540, while the sum is 21.

The square root of 61523013 is about 7843.6606887346. The cubic root of 61523013 is about 394.7715668998.

Adding to 61523013 its reverse (31032516), we get a palindrome (92555529).

The spelling of 61523013 in words is "sixty-one million, five hundred twenty-three thousand, thirteen".