897731951 has 2 divisors, whose sum is σ = 897731952. Its totient is φ = 897731950.

The previous prime is 897731921. The next prime is 897731959. The reversal of 897731951 is 159137798.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 897731951 - 2¹⁰ = 897730927 is a prime.

It is a Chen prime.

It is equal to p_45899348 and since 897731951 and 45899348 have the same sum of digits, it is a Honaker prime.

It is a self number, because there is not a number n which added to its sum of digits gives 897731951.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (897731959) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 448865975 + 448865976.

It is an arithmetic number, because the mean of its divisors is an integer number (448865976).

Almost surely, 2^897731951 is an apocalyptic number.

897731951 is a deficient number, since it is larger than the sum of its proper divisors (1).

897731951 is an equidigital number, since it uses as much as digits as its factorization.

897731951 is an evil number, because the sum of its binary digits is even.

The product of its digits is 476280, while the sum is 50.

The square root of 897731951 is about 29962.1753382494. The cubic root of 897731951 is about 964.6776737666.

The spelling of 897731951 in words is "eight hundred ninety-seven million, seven hundred thirty-one thousand, nine hundred fifty-one".