1251345426 has 16 divisors (see below), whose sum is σ = 2505786528. Its totient is φ = 416599200.

The previous prime is 1251345413. The next prime is 1251345463. The reversal of 1251345426 is 6245431521.

It is a super-2 number, since 2×1251345426² = 3131730750342242952, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 123715 + ... + 133446.

It is an arithmetic number, because the mean of its divisors is an integer number (156611658).

Almost surely, 2^1251345426 is an apocalyptic number.

1251345426 is an abundant number, since it is smaller than the sum of its proper divisors (1254441102).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1251345426 is a wasteful number, since it uses less digits than its factorization.

1251345426 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 257977.

The product of its digits is 28800, while the sum is 33.

The square root of 1251345426 is about 35374.3611391075. The cubic root of 1251345426 is about 1077.6036907622.

Adding to 1251345426 its reverse (6245431521), we get a palindrome (7496776947).

The spelling of 1251345426 in words is "one billion, two hundred fifty-one million, three hundred forty-five thousand, four hundred twenty-six".