1640962497 has 4 divisors (see below), whose sum is σ = 2187950000. Its totient is φ = 1093974996.

The previous prime is 1640962489. The next prime is 1640962513. The reversal of 1640962497 is 7942690461.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 1640962497 - 2³ = 1640962489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1640962447) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 273493747 + ... + 273493752.

It is an arithmetic number, because the mean of its divisors is an integer number (546987500).

Almost surely, 2^1640962497 is an apocalyptic number.

It is an amenable number.

1640962497 is a deficient number, since it is larger than the sum of its proper divisors (546987503).

1640962497 is an equidigital number, since it uses as much as digits as its factorization.

1640962497 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 546987502.

The product of its (nonzero) digits is 653184, while the sum is 48.

The square root of 1640962497 is about 40508.7953042299. The cubic root of 1640962497 is about 1179.5043635692.

The spelling of 1640962497 in words is "one billion, six hundred forty million, nine hundred sixty-two thousand, four hundred ninety-seven".