155231530 has 16 divisors (see below), whose sum is σ = 279605160. Its totient is φ = 62050752.

The previous prime is 155231521. The next prime is 155231533. The reversal of 155231530 is 35132551.

It can be written as a sum of positive squares in 4 ways, for example, as 140493609 + 14737921 = 11853^2 + 3839^2 .

It is a super-2 number, since 2×155231530² = 48193655812281800, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 155231495 and 155231504.

It is not an unprimeable number, because it can be changed into a prime (155231533) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13552 + ... + 22228.

Almost surely, 2^155231530 is an apocalyptic number.

155231530 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

155231530 is a deficient number, since it is larger than the sum of its proper divisors (124373630).

155231530 is a wasteful number, since it uses less digits than its factorization.

155231530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10473.

The product of its (nonzero) digits is 2250, while the sum is 25.

The square root of 155231530 is about 12459.1945967627. The cubic root of 155231530 is about 537.4358661536.

The spelling of 155231530 in words is "one hundred fifty-five million, two hundred thirty-one thousand, five hundred thirty".