1902251081 has 2 divisors, whose sum is σ = 1902251082. Its totient is φ = 1902251080.

The previous prime is 1902251053. The next prime is 1902251107. The reversal of 1902251081 is 1801522091.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1864857856 + 37393225 = 43184^2 + 6115^2 .

It is a cyclic number.

It is not a de Polignac number, because 1902251081 - 2¹⁰ = 1902250057 is a prime.

It is a super-2 number, since 2×1902251081² = 7237118350331337122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1902251011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 951125540 + 951125541.

It is an arithmetic number, because the mean of its divisors is an integer number (951125541).

Almost surely, 2^1902251081 is an apocalyptic number.

It is an amenable number.

1902251081 is a deficient number, since it is larger than the sum of its proper divisors (1).

1902251081 is an equidigital number, since it uses as much as digits as its factorization.

1902251081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1440, while the sum is 29.

The square root of 1902251081 is about 43614.8034616688. The cubic root of 1902251081 is about 1239.0512776575.

The spelling of 1902251081 in words is "one billion, nine hundred two million, two hundred fifty-one thousand, eighty-one".