1257425623 has 4 divisors (see below), whose sum is σ = 1257686680. Its totient is φ = 1257164568.

The previous prime is 1257425591. The next prime is 1257425633. The reversal of 1257425623 is 3265247521.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1257425623 - 2⁵ = 1257425591 is a prime.

It is a super-2 number, since 2×1257425623² = 3162238394753876258, 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 (1257425633) 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, 123165 + ... + 132982.

It is an arithmetic number, because the mean of its divisors is an integer number (314421670).

Almost surely, 2^1257425623 is an apocalyptic number.

1257425623 is a deficient number, since it is larger than the sum of its proper divisors (261057).

1257425623 is an equidigital number, since it uses as much as digits as its factorization.

1257425623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 261056.

The product of its digits is 100800, while the sum is 37.

The square root of 1257425623 is about 35460.1977292852. The cubic root of 1257425623 is about 1079.3462043740.

The spelling of 1257425623 in words is "one billion, two hundred fifty-seven million, four hundred twenty-five thousand, six hundred twenty-three".