155231249 has 4 divisors (see below), whose sum is σ = 155360436. Its totient is φ = 155102064.

The previous prime is 155231227. The next prime is 155231261. The reversal of 155231249 is 942132551.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 942132551 = 89 ⋅10585759.

It can be written as a sum of positive squares in 2 ways, for example, as 68145025 + 87086224 = 8255^2 + 9332^2 .

It is a cyclic number.

It is not a de Polignac number, because 155231249 - 2⁸ = 155230993 is a prime.

It is a super-2 number, since 2×155231249² = 48193481332200002, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (155231269) 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, 62774 + ... + 65199.

It is an arithmetic number, because the mean of its divisors is an integer number (38840109).

Almost surely, 2^155231249 is an apocalyptic number.

It is an amenable number.

155231249 is a deficient number, since it is larger than the sum of its proper divisors (129187).

155231249 is a wasteful number, since it uses less digits than its factorization.

155231249 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129186.

The product of its digits is 10800, while the sum is 32.

The square root of 155231249 is about 12459.1833199452. The cubic root of 155231249 is about 537.4355418647.

The spelling of 155231249 in words is "one hundred fifty-five million, two hundred thirty-one thousand, two hundred forty-nine".