2157078451 has 16 divisors (see below), whose sum is σ = 2390653440. Its totient is φ = 1929932320.

The previous prime is 2157078419. The next prime is 2157078463. The reversal of 2157078451 is 1548707512.

It is a cyclic number.

It is not a de Polignac number, because 2157078451 - 2⁵ = 2157078419 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2157078751) 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, 241206 + ... + 249988.

It is an arithmetic number, because the mean of its divisors is an integer number (149415840).

Almost surely, 2^2157078451 is an apocalyptic number.

2157078451 is a deficient number, since it is larger than the sum of its proper divisors (233574989).

2157078451 is a wasteful number, since it uses less digits than its factorization.

2157078451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9146.

The product of its (nonzero) digits is 78400, while the sum is 40.

The square root of 2157078451 is about 46444.3586563535. The cubic root of 2157078451 is about 1292.0777467536.

The spelling of 2157078451 in words is "two billion, one hundred fifty-seven million, seventy-eight thousand, four hundred fifty-one".