70061561 has 4 divisors (see below), whose sum is σ = 70246800. Its totient is φ = 69876324.

The previous prime is 70061533. The next prime is 70061587. The reversal of 70061561 is 16516007.

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: 16516007 = 109 ⋅151523.

It is a cyclic number.

It is not a de Polignac number, because 70061561 - 2¹⁴ = 70045177 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 70061561.

It is not an unprimeable number, because it can be changed into a prime (70061501) 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, 92051 + ... + 92808.

It is an arithmetic number, because the mean of its divisors is an integer number (17561700).

Almost surely, 2^70061561 is an apocalyptic number.

It is an amenable number.

70061561 is a deficient number, since it is larger than the sum of its proper divisors (185239).

70061561 is a wasteful number, since it uses less digits than its factorization.

70061561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 185238.

The product of its (nonzero) digits is 1260, while the sum is 26.

The square root of 70061561 is about 8370.2784302555. The cubic root of 70061561 is about 412.2493090790.

Adding to 70061561 its reverse (16516007), we get a palindrome (86577568).

The spelling of 70061561 in words is "seventy million, sixty-one thousand, five hundred sixty-one".