1953491597 has 18 divisors (see below), whose sum is σ = 2036459502. Its totient is φ = 1873831344.

The previous prime is 1953491537. The next prime is 1953491621. The reversal of 1953491597 is 7951943591.

It can be written as a sum of positive squares in only one way, i.e., 1943575396 + 9916201 = 44086^2 + 3149^2 .

It is not a de Polignac number, because 1953491597 - 2¹⁴ = 1953475213 is a prime.

It is a super-2 number, since 2×1953491597² = 7632258839099220818, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1953491537) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 9916103 + ... + 9916299.

It is an arithmetic number, because the mean of its divisors is an integer number (113136639).

Almost surely, 2^1953491597 is an apocalyptic number.

It is an amenable number.

1953491597 is a deficient number, since it is larger than the sum of its proper divisors (82967905).

1953491597 is an frugal number, since it uses more digits than its factorization.

1953491597 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 425 (or 311 counting only the distinct ones).

The product of its digits is 1530900, while the sum is 53.

The square root of 1953491597 is about 44198.3212011497. The cubic root of 1953491597 is about 1250.0782024674.

The spelling of 1953491597 in words is "one billion, nine hundred fifty-three million, four hundred ninety-one thousand, five hundred ninety-seven".