102520991 has 2 divisors, whose sum is σ = 102520992. Its totient is φ = 102520990.

The previous prime is 102520973. The next prime is 102521039. The reversal of 102520991 is 199025201.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 102520991 - 2⁶ = 102520927 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (102529991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51260495 + 51260496.

It is an arithmetic number, because the mean of its divisors is an integer number (51260496).

Almost surely, 2^102520991 is an apocalyptic number.

102520991 is a deficient number, since it is larger than the sum of its proper divisors (1).

102520991 is an equidigital number, since it uses as much as digits as its factorization.

102520991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1620, while the sum is 29.

The square root of 102520991 is about 10125.2649841868. The cubic root of 102520991 is about 468.0270259188.

The spelling of 102520991 in words is "one hundred two million, five hundred twenty thousand, nine hundred ninety-one".