60331991 has 2 divisors, whose sum is σ = 60331992. Its totient is φ = 60331990.

The previous prime is 60331987. The next prime is 60332003. The reversal of 60331991 is 19913306.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 60331991 - 2² = 60331987 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (60331961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30165995 + 30165996.

It is an arithmetic number, because the mean of its divisors is an integer number (30165996).

Almost surely, 2^60331991 is an apocalyptic number.

60331991 is a deficient number, since it is larger than the sum of its proper divisors (1).

60331991 is an equidigital number, since it uses as much as digits as its factorization.

60331991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4374, while the sum is 32.

The square root of 60331991 is about 7767.3670571179. The cubic root of 60331991 is about 392.2074924524.

The spelling of 60331991 in words is "sixty million, three hundred thirty-one thousand, nine hundred ninety-one".