1902489997 has 2 divisors, whose sum is σ = 1902489998. Its totient is φ = 1902489996.

The previous prime is 1902489983. The next prime is 1902490019. The reversal of 1902489997 is 7999842091.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1367076676 + 535413321 = 36974^2 + 23139^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1902489997 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1902489917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 951244998 + 951244999.

It is an arithmetic number, because the mean of its divisors is an integer number (951244999).

Almost surely, 2^1902489997 is an apocalyptic number.

It is an amenable number.

1902489997 is a deficient number, since it is larger than the sum of its proper divisors (1).

1902489997 is an equidigital number, since it uses as much as digits as its factorization.

1902489997 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2939328, while the sum is 58.

The square root of 1902489997 is about 43617.5423081127. The cubic root of 1902489997 is about 1239.1031489703.

The spelling of 1902489997 in words is "one billion, nine hundred two million, four hundred eighty-nine thousand, nine hundred ninety-seven".