1971496690 has 16 divisors (see below), whose sum is σ = 3557130840. Its totient is φ = 786723840.

The previous prime is 1971496679. The next prime is 1971496693. The reversal of 1971496690 is 966941791.

It can be written as a sum of positive squares in 4 ways, for example, as 919726929 + 1051769761 = 30327^2 + 32431^2 .

It is a super-2 number, since 2×1971496690² = 7773598397361912200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1971496693) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 229935 + ... + 238354.

Almost surely, 2^1971496690 is an apocalyptic number.

1971496690 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1971496690 is a deficient number, since it is larger than the sum of its proper divisors (1585634150).

1971496690 is a wasteful number, since it uses less digits than its factorization.

1971496690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 468717.

The product of its (nonzero) digits is 734832, while the sum is 52.

The square root of 1971496690 is about 44401.5392751197. The cubic root of 1971496690 is about 1253.9070689925.

The spelling of 1971496690 in words is "one billion, nine hundred seventy-one million, four hundred ninety-six thousand, six hundred ninety".