1977730537 has 2 divisors, whose sum is σ = 1977730538. Its totient is φ = 1977730536.

The previous prime is 1977730511. The next prime is 1977730561. The reversal of 1977730537 is 7350377791.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1653154281 + 324576256 = 40659^2 + 18016^2 .

It is a cyclic number.

It is not a de Polignac number, because 1977730537 - 2¹⁵ = 1977697769 is a prime.

It is a super-2 number, since 2×1977730537² = 7822836153964616738, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1977730507) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 988865268 + 988865269.

It is an arithmetic number, because the mean of its divisors is an integer number (988865269).

Almost surely, 2^1977730537 is an apocalyptic number.

It is an amenable number.

1977730537 is a deficient number, since it is larger than the sum of its proper divisors (1).

1977730537 is an equidigital number, since it uses as much as digits as its factorization.

1977730537 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 972405, while the sum is 49.

The square root of 1977730537 is about 44471.6824170168. The cubic root of 1977730537 is about 1255.2272910977.

The spelling of 1977730537 in words is "one billion, nine hundred seventy-seven million, seven hundred thirty thousand, five hundred thirty-seven".