1251101551 has 16 divisors (see below), whose sum is σ = 1447340544. Its totient is φ = 1059293664.

The previous prime is 1251101513. The next prime is 1251101563. The reversal of 1251101551 is 1551011521.

It is a cyclic number.

It is not a de Polignac number, because 1251101551 - 2¹⁵ = 1251068783 is a prime.

It is a Duffinian number.

It is a plaindrome in base 8.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1251101051) 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, 317445 + ... + 321361.

It is an arithmetic number, because the mean of its divisors is an integer number (90458784).

Almost surely, 2^1251101551 is an apocalyptic number.

1251101551 is a deficient number, since it is larger than the sum of its proper divisors (196238993).

1251101551 is a wasteful number, since it uses less digits than its factorization.

1251101551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4470.

The product of its (nonzero) digits is 250, while the sum is 22.

The square root of 1251101551 is about 35370.9139124224. The cubic root of 1251101551 is about 1077.5336814029.

The spelling of 1251101551 in words is "one billion, two hundred fifty-one million, one hundred one thousand, five hundred fifty-one".