155172946 has 8 divisors (see below), whose sum is σ = 238436604. Its totient is φ = 75694080.

The previous prime is 155172877. The next prime is 155172947. The reversal of 155172946 is 649271551.

It can be written as a sum of positive squares in 2 ways, for example, as 97792321 + 57380625 = 9889^2 + 7575^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 155172899 and 155172908.

It is not an unprimeable number, because it can be changed into a prime (155172947) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 946095 + ... + 946258.

Almost surely, 2^155172946 is an apocalyptic number.

155172946 is a deficient number, since it is larger than the sum of its proper divisors (83263658).

155172946 is a wasteful number, since it uses less digits than its factorization.

155172946 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1892396.

The product of its digits is 75600, while the sum is 40.

The square root of 155172946 is about 12456.8433401083. The cubic root of 155172946 is about 537.3682486526.

The spelling of 155172946 in words is "one hundred fifty-five million, one hundred seventy-two thousand, nine hundred forty-six".