97774781 has 12 divisors (see below), whose sum is σ = 106883712. Its totient is φ = 89393616.

The previous prime is 97774763. The next prime is 97774783. The reversal of 97774781 is 18747779.

It is not a de Polignac number, because 97774781 - 2²⁶ = 30665917 is a prime.

It is a super-2 number, since 2×97774781² = 19119815599195922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (97774783) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 15380 + ... + 20786.

It is an arithmetic number, because the mean of its divisors is an integer number (8906976).

Almost surely, 2^97774781 is an apocalyptic number.

It is an amenable number.

97774781 is a deficient number, since it is larger than the sum of its proper divisors (9108931).

97774781 is a wasteful number, since it uses less digits than its factorization.

97774781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5540 (or 5527 counting only the distinct ones).

The product of its digits is 691488, while the sum is 50.

The square root of 97774781 is about 9888.1131162624. The cubic root of 97774781 is about 460.6901753611.

The spelling of 97774781 in words is "ninety-seven million, seven hundred seventy-four thousand, seven hundred eighty-one".