121651501 has 4 divisors (see below), whose sum is σ = 121778272. Its totient is φ = 121524732.

The previous prime is 121651499. The next prime is 121651511. The reversal of 121651501 is 105156121.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 105156121 = 7 ⋅15022303.

It is a cyclic number.

It is not a de Polignac number, because 121651501 - 2¹ = 121651499 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121651511) 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, 61935 + ... + 63868.

It is an arithmetic number, because the mean of its divisors is an integer number (30444568).

Almost surely, 2^121651501 is an apocalyptic number.

It is an amenable number.

121651501 is a deficient number, since it is larger than the sum of its proper divisors (126771).

121651501 is an equidigital number, since it uses as much as digits as its factorization.

121651501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126770.

The product of its (nonzero) digits is 300, while the sum is 22.

The square root of 121651501 is about 11029.5739264942. The cubic root of 121651501 is about 495.4948640839.

The spelling of 121651501 in words is "one hundred twenty-one million, six hundred fifty-one thousand, five hundred one".