1025555251 has 16 divisors (see below), whose sum is σ = 1197990400. Its totient is φ = 877572360.

The previous prime is 1025555249. The next prime is 1025555273. The reversal of 1025555251 is 1525555201.

It is not a de Polignac number, because 1025555251 - 2¹ = 1025555249 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1025555291) 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, 234850 + ... + 239176.

It is an arithmetic number, because the mean of its divisors is an integer number (74874400).

Almost surely, 2^1025555251 is an apocalyptic number.

1025555251 is a deficient number, since it is larger than the sum of its proper divisors (172435149).

1025555251 is an frugal number, since it uses more digits than its factorization.

1025555251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5039 (or 5025 counting only the distinct ones).

The product of its (nonzero) digits is 12500, while the sum is 31.

The square root of 1025555251 is about 32024.2915768640. The cubic root of 1025555251 is about 1008.4468665521.

The spelling of 1025555251 in words is "one billion, twenty-five million, five hundred fifty-five thousand, two hundred fifty-one".