1254021251 has 16 divisors (see below), whose sum is σ = 1441623744. Its totient is φ = 1068555264.

The previous prime is 1254021247. The next prime is 1254021257. The reversal of 1254021251 is 1521204521.

It is not a de Polignac number, because 1254021251 - 2² = 1254021247 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1254021257) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1315391 + ... + 1316343.

It is an arithmetic number, because the mean of its divisors is an integer number (90101484).

Almost surely, 2^1254021251 is an apocalyptic number.

1254021251 is a deficient number, since it is larger than the sum of its proper divisors (187602493).

1254021251 is an equidigital number, since it uses as much as digits as its factorization.

1254021251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1870.

The product of its (nonzero) digits is 800, while the sum is 23.

The square root of 1254021251 is about 35412.1624728002. The cubic root of 1254021251 is about 1078.3712448871.

Adding to 1254021251 its reverse (1521204521), we get a palindrome (2775225772).

The spelling of 1254021251 in words is "one billion, two hundred fifty-four million, twenty-one thousand, two hundred fifty-one".