397249551 has 6 divisors (see below), whose sum is σ = 573804920. Its totient is φ = 264833028.

The previous prime is 397249493. The next prime is 397249553. The reversal of 397249551 is 155942793.

It is a happy number.

397249551 is a `hidden beast` number, since 3 + 97 + 2 + 4 + 9 + 551 = 666.

It is not a de Polignac number, because 397249551 - 2¹⁴ = 397233167 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 397249497 and 397249506.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (397249553) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 22069411 + ... + 22069428.

Almost surely, 2^397249551 is an apocalyptic number.

397249551 is a deficient number, since it is larger than the sum of its proper divisors (176555369).

397249551 is a wasteful number, since it uses less digits than its factorization.

397249551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44138845 (or 44138842 counting only the distinct ones).

The product of its digits is 340200, while the sum is 45.

The square root of 397249551 is about 19931.1201642055. The cubic root of 397249551 is about 735.1136239722.

The spelling of 397249551 in words is "three hundred ninety-seven million, two hundred forty-nine thousand, five hundred fifty-one".