61939121 has 2 divisors, whose sum is σ = 61939122. Its totient is φ = 61939120.

The previous prime is 61939117. The next prime is 61939127. The reversal of 61939121 is 12193916.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 33466225 + 28472896 = 5785^2 + 5336^2 .

It is a cyclic number.

It is not a de Polignac number, because 61939121 - 2² = 61939117 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (61939127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30969560 + 30969561.

It is an arithmetic number, because the mean of its divisors is an integer number (30969561).

Almost surely, 2^61939121 is an apocalyptic number.

It is an amenable number.

61939121 is a deficient number, since it is larger than the sum of its proper divisors (1).

61939121 is an equidigital number, since it uses as much as digits as its factorization.

61939121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2916, while the sum is 32.

The square root of 61939121 is about 7870.1411041988. The cubic root of 61939121 is about 395.6595741983.

The spelling of 61939121 in words is "sixty-one million, nine hundred thirty-nine thousand, one hundred twenty-one".