1057672391 has 4 divisors (see below), whose sum is σ = 1119888432. Its totient is φ = 995456352.

The previous prime is 1057672379. The next prime is 1057672393. The reversal of 1057672391 is 1932767501.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1932767501 = 7 ⋅276109643.

It is not a de Polignac number, because 1057672391 - 2⁶ = 1057672327 is a prime.

It is a super-2 number, since 2×1057672391² = 2237341773367313762, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1057672393) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31107995 + ... + 31108028.

It is an arithmetic number, because the mean of its divisors is an integer number (279972108).

Almost surely, 2^1057672391 is an apocalyptic number.

1057672391 is a deficient number, since it is larger than the sum of its proper divisors (62216041).

1057672391 is an equidigital number, since it uses as much as digits as its factorization.

1057672391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62216040.

The product of its (nonzero) digits is 79380, while the sum is 41.

The square root of 1057672391 is about 32521.8755762948. The cubic root of 1057672391 is about 1018.8659673223.

The spelling of 1057672391 in words is "one billion, fifty-seven million, six hundred seventy-two thousand, three hundred ninety-one".