61928921 has 2 divisors, whose sum is σ = 61928922. Its totient is φ = 61928920.

The previous prime is 61928897. The next prime is 61928927. The reversal of 61928921 is 12982916.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 61387225 + 541696 = 7835^2 + 736^2 .

It is a cyclic number.

It is not a de Polignac number, because 61928921 - 2¹⁸ = 61666777 is a prime.

It is not a weakly prime, because it can be changed into another prime (61928927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30964460 + 30964461.

It is an arithmetic number, because the mean of its divisors is an integer number (30964461).

Almost surely, 2^61928921 is an apocalyptic number.

It is an amenable number.

61928921 is a deficient number, since it is larger than the sum of its proper divisors (1).

61928921 is an equidigital number, since it uses as much as digits as its factorization.

61928921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15552, while the sum is 38.

The square root of 61928921 is about 7869.4930586411. The cubic root of 61928921 is about 395.6378542194.

The spelling of 61928921 in words is "sixty-one million, nine hundred twenty-eight thousand, nine hundred twenty-one".