30997155 has 48 divisors (see below), whose sum is σ = 58260384. Its totient is φ = 14031360.

The previous prime is 30997147. The next prime is 30997159. The reversal of 30997155 is 55179903.

It is not a de Polignac number, because 30997155 - 2³ = 30997147 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30997159) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 132919 + ... + 133151.

It is an arithmetic number, because the mean of its divisors is an integer number (1213758).

Almost surely, 2^30997155 is an apocalyptic number.

30997155 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

30997155 is a deficient number, since it is larger than the sum of its proper divisors (27263229).

30997155 is a wasteful number, since it uses less digits than its factorization.

30997155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 436 (or 429 counting only the distinct ones).

The product of its (nonzero) digits is 42525, while the sum is 39.

The square root of 30997155 is about 5567.5088684258. The cubic root of 30997155 is about 314.1284550226.

The spelling of 30997155 in words is "thirty million, nine hundred ninety-seven thousand, one hundred fifty-five".