1951796202489 has 81 divisors (see below), whose sum is σ = 3329943954831. Its totient is φ = 1098429958080.

The previous prime is 1951796202487. The next prime is 1951796202509. The reversal of 1951796202489 is 9842026971591.

The square root of 1951796202489 is 1397067.

It is a perfect power (a square), and thus also a powerful number.

1951796202489 is a `hidden beast` number, since 1 + 9 + 517 + 96 + 2 + 0 + 24 + 8 + 9 = 666.

It can be written as a sum of positive squares in only one way, i.e., 102761919225 + 1849034283264 = 320565^2 + 1359792^2 .

It is not a de Polignac number, because 1951796202489 - 2¹ = 1951796202487 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is not an unprimeable number, because it can be changed into a prime (1951796202487) by changing a digit.

It is a polite number, since it can be written in 80 ways as a sum of consecutive naturals, for example, 2083026429 + ... + 2083027365.

Almost surely, 2^{1951796202489} is an apocalyptic number.

1951796202489 is the 1397067-th square number.

1951796202489 is the 698534-th centered octagonal number.

It is an amenable number.

1951796202489 is a deficient number, since it is larger than the sum of its proper divisors (1378147752342).

1951796202489 is an frugal number, since it uses more digits than its factorization.

1951796202489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2036 (or 1018 counting only the distinct ones).

The product of its (nonzero) digits is 19595520, while the sum is 63.

The spelling of 1951796202489 in words is "one trillion, nine hundred fifty-one billion, seven hundred ninety-six million, two hundred two thousand, four hundred eighty-nine".