61659213 has 32 divisors (see below), whose sum is σ = 102961152. Its totient is φ = 31886400.

The previous prime is 61659181. The next prime is 61659287. The reversal of 61659213 is 31295616.

It is a happy number.

It is not a de Polignac number, because 61659213 - 2⁵ = 61659181 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61659413) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 67228 + ... + 68138.

It is an arithmetic number, because the mean of its divisors is an integer number (3217536).

Almost surely, 2^61659213 is an apocalyptic number.

It is an amenable number.

61659213 is a deficient number, since it is larger than the sum of its proper divisors (41301939).

61659213 is a wasteful number, since it uses less digits than its factorization.

61659213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1225.

The product of its digits is 9720, while the sum is 33.

The square root of 61659213 is about 7852.3380594572. The cubic root of 61659213 is about 395.0626680466.

It can be divided in two parts, 616592 and 13, that added together give a triangular number (616605 = T₁₁₁₀).

The spelling of 61659213 in words is "sixty-one million, six hundred fifty-nine thousand, two hundred thirteen".