61213439 has 8 divisors (see below), whose sum is σ = 71105568. Its totient is φ = 51608160.

The previous prime is 61213433. The next prime is 61213441. The reversal of 61213439 is 93431216.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61213439 is a prime.

It is a super-2 number, since 2×61213439² = 7494170228413442, 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 (61213433) 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, 71252 + ... + 72105.

It is an arithmetic number, because the mean of its divisors is an integer number (8888196).

Almost surely, 2^61213439 is an apocalyptic number.

61213439 is a deficient number, since it is larger than the sum of its proper divisors (9892129).

61213439 is a wasteful number, since it uses less digits than its factorization.

61213439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 143425.

The product of its digits is 3888, while the sum is 29.

The square root of 61213439 is about 7823.9017759683. The cubic root of 61213439 is about 394.1083106420.

The spelling of 61213439 in words is "sixty-one million, two hundred thirteen thousand, four hundred thirty-nine".