61213615 has 12 divisors (see below), whose sum is σ = 75301992. Its totient is φ = 47769920.

The previous prime is 61213571. The next prime is 61213627. The reversal of 61213615 is 51631216.

It is not a de Polignac number, because 61213615 - 2⁷ = 61213487 is a prime.

It is a super-2 number, since 2×61213615² = 7494213322736450, which contains 22 as substring.

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 61213615.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4764 + ... + 12046.

It is an arithmetic number, because the mean of its divisors is an integer number (6275166).

Almost surely, 2^61213615 is an apocalyptic number.

61213615 is a deficient number, since it is larger than the sum of its proper divisors (14088377).

61213615 is an equidigital number, since it uses as much as digits as its factorization.

61213615 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7370 (or 7329 counting only the distinct ones).

The product of its digits is 1080, while the sum is 25.

The square root of 61213615 is about 7823.9130235452. The cubic root of 61213615 is about 394.1086883531.

The spelling of 61213615 in words is "sixty-one million, two hundred thirteen thousand, six hundred fifteen".