1072638491 has 2 divisors, whose sum is σ = 1072638492. Its totient is φ = 1072638490.

The previous prime is 1072638461. The next prime is 1072638517. The reversal of 1072638491 is 1948362701.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1072638491 - 2²⁶ = 1005529627 is a prime.

It is not a weakly prime, because it can be changed into another prime (1072638431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 536319245 + 536319246.

It is an arithmetic number, because the mean of its divisors is an integer number (536319246).

Almost surely, 2^1072638491 is an apocalyptic number.

1072638491 is a deficient number, since it is larger than the sum of its proper divisors (1).

1072638491 is an equidigital number, since it uses as much as digits as its factorization.

1072638491 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72576, while the sum is 41.

The square root of 1072638491 is about 32751.1601473902. The cubic root of 1072638491 is about 1023.6491396811.

The spelling of 1072638491 in words is "one billion, seventy-two million, six hundred thirty-eight thousand, four hundred ninety-one".