1971763477 has 2 divisors, whose sum is σ = 1971763478. Its totient is φ = 1971763476.

The previous prime is 1971763459. The next prime is 1971763483. The reversal of 1971763477 is 7743671791.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1967898321 + 3865156 = 44361^2 + 1966^2 .

It is a cyclic number.

It is not a de Polignac number, because 1971763477 - 2²³ = 1963374869 is a prime.

It is a super-2 number, since 2×1971763477² = 7775702418462259058, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1971763427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 985881738 + 985881739.

It is an arithmetic number, because the mean of its divisors is an integer number (985881739).

Almost surely, 2^1971763477 is an apocalyptic number.

It is an amenable number.

1971763477 is a deficient number, since it is larger than the sum of its proper divisors (1).

1971763477 is an equidigital number, since it uses as much as digits as its factorization.

1971763477 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1555848, while the sum is 52.

The square root of 1971763477 is about 44404.5434274467. The cubic root of 1971763477 is about 1253.9636268720.

The spelling of 1971763477 in words is "one billion, nine hundred seventy-one million, seven hundred sixty-three thousand, four hundred seventy-seven".