61621413 has 32 divisors (see below), whose sum is σ = 100465920. Its totient is φ = 32793600.

The previous prime is 61621387. The next prime is 61621421. The reversal of 61621413 is 31412616.

It is not a de Polignac number, because 61621413 - 2¹⁸ = 61359269 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61621493) 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, 35203 + ... + 36911.

It is an arithmetic number, because the mean of its divisors is an integer number (3139560).

Almost surely, 2^61621413 is an apocalyptic number.

It is an amenable number.

61621413 is a deficient number, since it is larger than the sum of its proper divisors (38844507).

61621413 is a wasteful number, since it uses less digits than its factorization.

61621413 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1837.

The product of its digits is 864, while the sum is 24.

The square root of 61621413 is about 7849.9307640259. The cubic root of 61621413 is about 394.9819208731.

The spelling of 61621413 in words is "sixty-one million, six hundred twenty-one thousand, four hundred thirteen".