1057620491 has 8 divisors (see below), whose sum is σ = 1061286624. Its totient is φ = 1053961920.

The previous prime is 1057620481. The next prime is 1057620493. The reversal of 1057620491 is 1940267501.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1057620491 is a prime.

It is a super-3 number, since 3×1057620491³ (a number of 28 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1057620493) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 426431 + ... + 428903.

It is an arithmetic number, because the mean of its divisors is an integer number (132660828).

Almost surely, 2^1057620491 is an apocalyptic number.

1057620491 is a deficient number, since it is larger than the sum of its proper divisors (3666133).

1057620491 is an equidigital number, since it uses as much as digits as its factorization.

1057620491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3781.

The product of its (nonzero) digits is 15120, while the sum is 35.

The square root of 1057620491 is about 32521.0776420462. The cubic root of 1057620491 is about 1018.8493017936.

Adding to 1057620491 its reverse (1940267501), we get a palindrome (2997887992).

The spelling of 1057620491 in words is "one billion, fifty-seven million, six hundred twenty thousand, four hundred ninety-one".