997152031 has 4 divisors (see below), whose sum is σ = 997823200. Its totient is φ = 996480864.

The previous prime is 997152019. The next prime is 997152043. The reversal of 997152031 is 130251799.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 130251799 = 1657 ⋅78607.

It is an interprime number because it is at equal distance from previous prime (997152019) and next prime (997152043).

It is a cyclic number.

It is not a de Polignac number, because 997152031 - 2⁵ = 997151999 is a prime.

It is a super-2 number, since 2×997152031² = 1988624345854849922, 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 (997152001) 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, 333351 + ... + 336328.

It is an arithmetic number, because the mean of its divisors is an integer number (249455800).

Almost surely, 2^997152031 is an apocalyptic number.

997152031 is the 19972-nd centered pentagonal number.

997152031 is a deficient number, since it is larger than the sum of its proper divisors (671169).

997152031 is a wasteful number, since it uses less digits than its factorization.

997152031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 671168.

The product of its (nonzero) digits is 17010, while the sum is 37.

The square root of 997152031 is about 31577.7141509641. The cubic root of 997152031 is about 999.0497743572.

The spelling of 997152031 in words is "nine hundred ninety-seven million, one hundred fifty-two thousand, thirty-one".