69520991 has 2 divisors, whose sum is σ = 69520992. Its totient is φ = 69520990.

The previous prime is 69520961. The next prime is 69521017. The reversal of 69520991 is 19902596.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 69520991 - 2¹⁴ = 69504607 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 (69520951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34760495 + 34760496.

It is an arithmetic number, because the mean of its divisors is an integer number (34760496).

Almost surely, 2^69520991 is an apocalyptic number.

69520991 is a deficient number, since it is larger than the sum of its proper divisors (1).

69520991 is an equidigital number, since it uses as much as digits as its factorization.

69520991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 43740, while the sum is 41.

The square root of 69520991 is about 8337.9248617387. The cubic root of 69520991 is about 411.1863142976.

The spelling of 69520991 in words is "sixty-nine million, five hundred twenty thousand, nine hundred ninety-one".