997960551 has 16 divisors (see below), whose sum is σ = 1523741184. Its totient is φ = 569123424.

The previous prime is 997960507. The next prime is 997960553. The reversal of 997960551 is 155069799.

It is a happy number.

It is not a de Polignac number, because 997960551 - 2⁶ = 997960487 is a prime.

It is a super-2 number, since 2×997960551² = 1991850522704447202, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 997960494 and 997960503.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (997960553) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 36676 + ... + 57801.

It is an arithmetic number, because the mean of its divisors is an integer number (95233824).

Almost surely, 2^997960551 is an apocalyptic number.

997960551 is a deficient number, since it is larger than the sum of its proper divisors (525780633).

997960551 is a wasteful number, since it uses less digits than its factorization.

997960551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94990.

The product of its (nonzero) digits is 765450, while the sum is 51.

The square root of 997960551 is about 31590.5136235548. The cubic root of 997960551 is about 999.3197209921.

The spelling of 997960551 in words is "nine hundred ninety-seven million, nine hundred sixty thousand, five hundred fifty-one".