1351431957 has 4 divisors (see below), whose sum is σ = 1801909280. Its totient is φ = 900954636.

The previous prime is 1351431947. The next prime is 1351431967. The reversal of 1351431957 is 7591341531.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 7591341531 = 3 ⋅2530447177.

It is an interprime number because it is at equal distance from previous prime (1351431947) and next prime (1351431967).

It is not a de Polignac number, because 1351431957 - 2¹⁶ = 1351366421 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1351431947) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 225238657 + ... + 225238662.

It is an arithmetic number, because the mean of its divisors is an integer number (450477320).

Almost surely, 2^1351431957 is an apocalyptic number.

It is an amenable number.

1351431957 is a deficient number, since it is larger than the sum of its proper divisors (450477323).

1351431957 is an equidigital number, since it uses as much as digits as its factorization.

1351431957 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 450477322.

The product of its digits is 56700, while the sum is 39.

The square root of 1351431957 is about 36761.8274436949. The cubic root of 1351431957 is about 1105.6000800054.

The spelling of 1351431957 in words is "one billion, three hundred fifty-one million, four hundred thirty-one thousand, nine hundred fifty-seven".