1618657971 has 32 divisors (see below), whose sum is σ = 2489315328. Its totient is φ = 916440480.

The previous prime is 1618657961. The next prime is 1618658029. The reversal of 1618657971 is 1797568161.

It is not a de Polignac number, because 1618657971 - 2⁹ = 1618657459 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1618657921) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1666516 + ... + 1667486.

It is an arithmetic number, because the mean of its divisors is an integer number (77791104).

Almost surely, 2^1618657971 is an apocalyptic number.

1618657971 is a deficient number, since it is larger than the sum of its proper divisors (870657357).

1618657971 is a wasteful number, since it uses less digits than its factorization.

1618657971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1631.

The product of its digits is 635040, while the sum is 51.

The square root of 1618657971 is about 40232.5486515582. The cubic root of 1618657971 is about 1174.1358900442.

The spelling of 1618657971 in words is "one billion, six hundred eighteen million, six hundred fifty-seven thousand, nine hundred seventy-one".