977551693 has 2 divisors, whose sum is σ = 977551694. Its totient is φ = 977551692.

The previous prime is 977551667. The next prime is 977551699. The reversal of 977551693 is 396155779.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 670706404 + 306845289 = 25898^2 + 17517^2 .

It is an emirp because it is prime and its reverse (396155779) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 977551693 - 2⁵ = 977551661 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 977551693.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (977551699) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 488775846 + 488775847.

It is an arithmetic number, because the mean of its divisors is an integer number (488775847).

Almost surely, 2^977551693 is an apocalyptic number.

It is an amenable number.

977551693 is a deficient number, since it is larger than the sum of its proper divisors (1).

977551693 is an equidigital number, since it uses as much as digits as its factorization.

977551693 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1786050, while the sum is 52.

The square root of 977551693 is about 31265.8230820812. The cubic root of 977551693 is about 992.4605302528.

The spelling of 977551693 in words is "nine hundred seventy-seven million, five hundred fifty-one thousand, six hundred ninety-three".