1902878161 has 2 divisors, whose sum is σ = 1902878162. Its totient is φ = 1902878160.

The previous prime is 1902878141. The next prime is 1902878191. The reversal of 1902878161 is 1618782091.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1100912400 + 801965761 = 33180^2 + 28319^2 .

It is a cyclic number.

It is not a de Polignac number, because 1902878161 - 2⁵ = 1902878129 is a prime.

It is a super-2 number, since 2×1902878161² = 7241890591221483842, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1902878111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 951439080 + 951439081.

It is an arithmetic number, because the mean of its divisors is an integer number (951439081).

Almost surely, 2^1902878161 is an apocalyptic number.

It is an amenable number.

1902878161 is a deficient number, since it is larger than the sum of its proper divisors (1).

1902878161 is an equidigital number, since it uses as much as digits as its factorization.

1902878161 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48384, while the sum is 43.

The square root of 1902878161 is about 43621.9917128964. The cubic root of 1902878161 is about 1239.1874144203.

The spelling of 1902878161 in words is "one billion, nine hundred two million, eight hundred seventy-eight thousand, one hundred sixty-one".