121390154 has 8 divisors (see below), whose sum is σ = 182326788. Its totient is φ = 60614560.

The previous prime is 121390153. The next prime is 121390169. The reversal of 121390154 is 451093121.

It can be written as a sum of positive squares in 2 ways, for example, as 111872929 + 9517225 = 10577^2 + 3085^2 .

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

It is not an unprimeable number, because it can be changed into a prime (121390153) 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, 38357 + ... + 41400.

Almost surely, 2^121390154 is an apocalyptic number.

121390154 is a deficient number, since it is larger than the sum of its proper divisors (60936634).

121390154 is an equidigital number, since it uses as much as digits as its factorization.

121390154 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80520.

The product of its (nonzero) digits is 1080, while the sum is 26.

The square root of 121390154 is about 11017.7200000726. The cubic root of 121390154 is about 495.1397816304.

The spelling of 121390154 in words is "one hundred twenty-one million, three hundred ninety thousand, one hundred fifty-four".