1251429163 has 6 divisors (see below), whose sum is σ = 1275489404. Its totient is φ = 1227814536.

The previous prime is 1251429131. The next prime is 1251429169. The reversal of 1251429163 is 3619241521.

It is not a de Polignac number, because 1251429163 - 2⁵ = 1251429131 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1251429169) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 219945 + ... + 225562.

Almost surely, 2^1251429163 is an apocalyptic number.

1251429163 is a deficient number, since it is larger than the sum of its proper divisors (24060241).

1251429163 is an frugal number, since it uses more digits than its factorization.

1251429163 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 445613 (or 445560 counting only the distinct ones).

The product of its digits is 12960, while the sum is 34.

The square root of 1251429163 is about 35375.5447025201. The cubic root of 1251429163 is about 1077.6277271009.

The spelling of 1251429163 in words is "one billion, two hundred fifty-one million, four hundred twenty-nine thousand, one hundred sixty-three".